Waltee c



(No Model.) v Y W; O. CHURCH.

CIRCULAR SLIDE VALVE.

No. 356,984. Patented Feb.- 1, 1887.

FIG.2.

Inveuiom Mlfar 0. 01110707 n u l 1 Witnesses,

N, PETERS. PhulbLllhogrzplmr, W-lslinglon. D. C.

4 UNITED STATES PATENT OFFICE.

WALTER C. CHURCH, OF BRIXTON, COUNTY OF SURREY, ASSIGNOR TO THE WALTER C. CHURCH ENGINEERING COMPANY, (LIMITED,) OFLONDON,

' i ENGLAND.

CIRCULAR SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 356,984, dated February 1, 1887.

Application filed June 10,1884. Serial No. 134,439. (No model.) Patented in England January 21,1880, No. 266; in France July 7, 1880, 1\'o. 137,676; in Germany July 16, 1880, No. 13,194; in Belgium July 29, 1880, No. 52,153, and in Austria-Hungary Octoher 30,1880, No. 4,187.

To all whom/it may concern.-

Be it known that I, WALTER CHARLES CHURCH, a citizen of England, residing at Brixton, in thecounty of Surrey, England,

5 have invented a new and useful Improvement in Circular Slide and SluiceValves, (for which I have obtained patents in GreatBi-itain, dated January 21, 1880, No. 266 France, dated July 7, 1880; Belgium, dated July 29, 18.80; Austria-Hungary, dated October 30, 1880, and Germany,dated July 16,'1880,) of which thefollowing is a specification.

Slides for governing ports of stcam-cylinders and other passages for fluid have been made of circular form, the ports or passages which they govern being made of crescent or like suitable shape, so that the circular edges of the slide, as it moves rectilinearly to and fro,

cover and uncover them in a manner similar 2G to that in which a rectangular slide operates.

Such circular slides are held in a circular loop or eye of the slide-rod which moves them, be-

ing free to turn round in such loop or eye, so

that when any roughness or irregularity in the rubbing-surfaces of the slide and of the facing on which it works presents itself, or when there is any tendency to cohesion at any part of these surfaces, the slide may, while it moves rectilinearly, turn partly round its own axis,

and thereby bring fresh portions of the surfaces to bear against each other. As the chief object to be attained by the use of such circular slides is to insure, by their turning round,

equalization of wear and to prevent the formation of ridges and hollows in the rubbing-surfaces, and as such turning round is uncertain and precarious when it depends only on accidental inequalities, I, according to this invention, so construct and arrange the slide ,0 and the eye or loop in which it is held that at every to-and-fro stroke of the slide it is caused to turn partly round always in one direction, and thus I insure a continual change of the parts of the surfaces which rub against each other. Iwill describe the construction which I employ for this purpose, referring to the accompanying drawings.

Figure l is a plan of a circular slide with the loop or eye of its rod according to my invention. Fig. 2 is a like plan, and Fig. 3 a side View showing a modified arrangement according to my invention.

7 In allthe figures similar parts are marked by similar lettersof reference. A is the circular slide, which has its boss 5 inclosed in the eye or loop 13 of the slide-rod C, by the reciprocation of which the slide is moved to and fro over the poltfaces.

According to the arrangement shown in Fig.

1, the eye B fits the circular boss of the slide only in two opposite parts, D D, situated about midway between the longitudinal and transverse diameters of. the eye, and the slidejacket is made with two opposite straight surfaces, E E almost touching the circular flange of the slide. When the slide-rod moves inthe direction of the arrow F, the slide is pressed on by the part of the eye marked D, and conseqncntly itsflange is borne against the straight face E, the frictional contact causing it, as it moves longitudinally, to roll along E, so that it partly revolves withinthe eye in the direction of the arrows G. Again, when the sliderod makesits back stroke in the direction indicated by the arrow F the slide is pressed by the part D of the eye, and thus its flange is borne against the opposite surface, E, causing it to roll, and therefore to revolve within the eye in the same direction, G, as before. Thus at every stroke of the slide-rod in both directions the slide is caused to turn partly r'ound always in one direction, so that its rub bing-surface and the port-face on which it works are subjected to uniform wear.

In the arrangement shown in Figs. 2 and 3 8 5 .a number of rollers, L, mounted on the slide bear successively against the parts D D of the eye, causing the flange of the slide to roll alternately along the straight bearing-strips E E which project inward from the opposite o sides of the slide-jacket. The eye B is itself guided along straight faces M M, formed on the sides of the jacket.

Having thus described the nature of my in vention and the best means I know of carrybut out by a straight line, forming an angle ing it out in practice, I elain1 with the perpendicular, and the rolling faces 1. The combination, with a circular slide, of E E upon opposite faces of the slide-jacket, 1 a loop on the slide-rod, having frictional consubstantially as described.

5 tact with said slide at two opposite points only, In testimony whercofI have signed my name said points being cut by a diametrical line, to this specification, in the presence of two forming an acute anglewith the perpendicular, subscribing witnesses, this 6th day of May, and two oppositerolling faces on the slide- A. D. 1884. jacket, substantially as described.

W. 'o. CHURCH.

r0 2. The combination, with the circular slide \Vitnesses:

a, of the loop 13 on the slide-rod, said loop hav- JNo. I. M. MILLARD, ing the contact surfaces or parts D and D, J. \VATT. 

